Misfire woes

johnymd

Club Member
I've never used the reply button. I just type in the message section and click go advanced, then managed attachement. Its all a bit long winded so I checked the way Rob does it and its much simpler. Chears Rob.
 

racer

Club Member
Just a test, no titillation intended whatsoever :D
 

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DatsunMan

Active Forum User
Misfire Update!

After all the advice I've received from members, I have done the following:-

New Dizzy cap & rotor arm - no improvement

New Fuel Filter - no improvement

2nd-hand ECU sourced from eBay - due tomorrow... so I'll soon find out!

Cheers All
Regards again, Geoff

p.s.
have finally managed to attach some photos...
paperclip suddenly appeared!


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DatsunMan

Active Forum User
more photos

hopefully!
attachment.php

attachment.php

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DatsunMan

Active Forum User
Changed ECU, with one sourced off eBay...

Car starts & runs, so at least its the right one...

Although, I did check the numbers corresponded of course...

But guess what... No Improvement !

Looks like I need to give up now, & seek help from a garage perhaps?!

p.s.
couple more photos attached, now I've gone advanced!!
 

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DatsunMan

Active Forum User
Hi Huw,

Great find... I've just bought it off eBay now, thanks.

Obviously, my issues remain!
Even replaced ecu, but no difference...
Still think it might be electrical, so maybe I should try the coil next?!
Onwards & upwards...
Manual will help no end.

Cheers, Geoff
 

Ped

Club Member
Hi Huw,

Great find... I've just bought it off eBay now, thanks.

Obviously, my issues remain!
Even replaced ecu, but no difference...
Still think it might be electrical, so maybe I should try the coil next?!
Onwards & upwards...
Manual will help no end.

Cheers, Geoff

Maybe you should get a fuel injection place to have a look at it. They can usually see where the fault is or is not coming from. I used a Bosch place in Reading. This way you can narrow down or resolve the issue more quickly.
 

monza

Well-Known Forum User
For the moment the problem still seems to be on 3 cylinders and not a general fault - which means 'general' parts like the coil, air flow meter, should be ok...


You need to confirm if the injectors are firing on the cylinders where the problem occurs, cheapo stethoscope ( is that the right spelling ? ) from ebay is needed to listen to them clicking.

Injectors could be gummed up and need removing and testing on bench ( stick a load of redex into the tank )

Remove spark plugs and with good battery start car as normal ( ie crank it ), do you get petrol mist blown out of each spark plug hole ( small piece of tube to sniff through if not obvious )

Check the wiring to series resistors and the resistors themselves ( check connections )

Is there voltage at all injectors when running on 3 cylinders ?

You need to get the car running on easy start ( 2 man job, 1 man to control flow of easy start and other to keep car running - ) does its run more evenly ( ie all cylinders seem to be firing ). You may need to add easy-start to breather / or other port in intake manifold as airflow meter flap may block flow...

Could be a fault with the dizzy, as parts of it a cylinder specific..but they normally fail in a random fashion rather than knocking the same 3 cylinders out.

Have you done a compression test on all cylinders ?, could be valve / piston problem.

The injection system on the 280zx is simple so i would eliminate the obvious rather than paying someone at a garage to plug a 2015 code reader in to a 1970's ecu that doesn't have a code reader socket.:smash:


cheers
 

niroshann

Club Member
Just while you are looking into the suggestions above, I would add that you should have a peep into the fuel tank via the hatch in the boot. Look for residue like flakes of rust. I had an issue where the car would run fine for a few mins then start coughing and spluttering then dies. A minute later it would start and run fine. Turned out to be rusty bits in tank building up and starving engine of fuel then they drop back when the engine dies and allows flow again. Going by the talk about only half the engine firing it sounds like the stuff mentioned above, but I would check this to tick it off before getting carried away..
 

DatsunMan

Active Forum User
Update! ok,ok, it's about time, & yes, I forgot to post the conclusion to this dilemma a few months ago!
Suffice to say, after changing various electrical & fuel components...it turned out to be cured by cleaning the injectors & fuel tank! Including new filter of course, plus additional one fitted. And it's run just fine ever since...
Better late than never!!
Thanks again to all respondees
Regards, Geoff - Isle of Man
 

candy red

Club Member
Have you checked you have a spark at the offending cylinders pull the plug see what condition there in

Check fuel pressure with inline gauge,
Check fuel filter.
Check all electrical connections to fuel injection system faulty or dirty connections can make a big difference to how it runs .
good luck

Derrick

Glad you got it sorted so frustrating

Derrick;)
 
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